{"entities":{"Q1618":{"pageid":3234,"ns":120,"title":"Item:Q1618","lastrevid":7166,"modified":"2026-09-03T13:26:08Z","type":"item","id":"Q1618","labels":{"en":{"language":"en","value":"Linearisation of the pendulum about its two equilibria"}},"descriptions":{},"aliases":{},"claims":{"P1":[{"mainsnak":{"snaktype":"value","property":"P1","hash":"6056844c4a6d3699fbafab69805eed5ca36eab0e","datavalue":{"value":{"entity-type":"item","numeric-id":4,"id":"Q4"},"type":"wikibase-entityid"},"datatype":"wikibase-item"},"type":"statement","id":"Q1618$B83A40A8-73DD-440E-BE85-BFB784667ECA","rank":"normal"}],"P4":[{"mainsnak":{"snaktype":"value","property":"P4","hash":"a1129bb3c07cd443de4242ace0401ab4ed79c496","datavalue":{"value":"\\\\theta\\\\approx 0:\\\\ \\\\ \\\\frac{d^{2}\\\\theta}{dt^{2}}+\\\\frac{g}{L}\\\\theta=0;\\\\qquad \\\\phi=\\\\theta-\\\\pi\\\\approx 0:\\\\ \\\\ \\\\frac{d^{2}\\\\phi}{dt^{2}}-\\\\frac{g}{L}\\\\phi=0","type":"string"},"datatype":"string"},"type":"statement","id":"Q1618$2EC291B4-51C5-4D50-99AF-7D9CFC4AF7AB","rank":"normal"}]},"sitelinks":{}}}}